TEACHING MACHINE
United States Patent 3466758

Inventors:
Miller, Paul F.
Publication Date:
09/16/1969
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Assignee:
Miller, Paul F.
Primary Class:
434/335
International Classes:
G09B7/06; G09B7/00; G09B1/00; G09B3/02
US Patent References:
3096592Educational testing device
3212199Teaching machine
3221418Teaching machine




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